diff --git a/vtysh/vtysh_config.c b/vtysh/vtysh_config.c
new file mode 100644
index 0000000..b9c9ad6
--- /dev/null
+++ b/vtysh/vtysh_config.c
@@ -0,0 +1,426 @@
+/* Configuration generator.
+   Copyright (C) 2000 Kunihiro Ishiguro
+
+This file is part of GNU Zebra.
+
+GNU Zebra is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+GNU Zebra is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Zebra; see the file COPYING.  If not, write to the Free
+Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.  */
+
+#include <zebra.h>
+
+#include "command.h"
+#include "linklist.h"
+#include "memory.h"
+
+#include "vtysh/vtysh.h"
+
+vector configvec;
+
+struct config
+{
+  /* Configuration node name. */
+  char *name;
+
+  /* Configuration string line. */
+  struct list *line;
+
+  /* Configuration can be nest. */
+  struct config *config;
+
+  /* Index of this config. */
+  u_int32_t index;
+};
+
+struct list *config_top;
+
+int
+line_cmp (char *c1, char *c2)
+{
+  return strcmp (c1, c2);
+}
+
+void
+line_del (char *line)
+{
+  XFREE (MTYPE_VTYSH_CONFIG_LINE, line);
+}
+
+struct config *
+config_new ()
+{
+  struct config *config;
+  config = XCALLOC (MTYPE_VTYSH_CONFIG, sizeof (struct config));
+  return config;
+}
+
+int
+config_cmp (struct config *c1, struct config *c2)
+{
+  return strcmp (c1->name, c2->name);
+}
+
+void
+config_del (struct config* config)
+{
+  list_delete (config->line);
+  if (config->name)
+    XFREE (MTYPE_VTYSH_CONFIG_LINE, config->name);
+  XFREE (MTYPE_VTYSH_CONFIG, config);
+}
+
+struct config *
+config_get (int index, char *line)
+{
+  struct config *config;
+  struct config *config_loop;
+  struct list *master;
+  struct listnode *nn;
+
+  config = config_loop = NULL;
+
+  master = vector_lookup_ensure (configvec, index);
+
+  if (! master)
+    {
+      master = list_new ();
+      master->del = (void (*) (void *))config_del;
+      master->cmp = (int (*)(void *, void *)) config_cmp;
+      vector_set_index (configvec, index, master);
+    }
+  
+  LIST_LOOP (master, config_loop, nn)
+    {
+      if (strcmp (config_loop->name, line) == 0)
+	config = config_loop;
+    }
+
+  if (! config)
+    {
+      config = config_new ();
+      config->line = list_new ();
+      config->line->del = (void (*) (void *))line_del;
+      config->line->cmp = (int (*)(void *, void *)) line_cmp;
+      config->name = XSTRDUP (MTYPE_VTYSH_CONFIG_LINE, line);
+      config->index = index;
+      listnode_add (master, config);
+    }
+  return config;
+}
+
+void
+config_add_line (struct list *config, char *line)
+{
+  listnode_add (config, XSTRDUP (MTYPE_VTYSH_CONFIG_LINE, line));
+}
+
+void
+config_add_line_uniq (struct list *config, char *line)
+{
+  struct listnode *nn;
+  char *pnt;
+
+  LIST_LOOP (config, pnt, nn)
+    {
+      if (strcmp (pnt, line) == 0)
+	return;
+    }
+  listnode_add_sort (config, XSTRDUP (MTYPE_VTYSH_CONFIG_LINE, line));
+}
+
+void
+vtysh_config_parse_line (char *line)
+{
+  char c;
+  static struct config *config = NULL;
+
+  if (! line)
+    return;
+
+  c = line[0];
+
+  if (c == '\0')
+    return;
+
+  /* printf ("[%s]\n", line); */
+
+  switch (c)
+    {
+    case '!':
+    case '#':
+      break;
+    case ' ':
+      /* Store line to current configuration. */
+      if (config)
+	{
+	  if (strncmp (line, " address-family vpnv4", strlen (" address-family vpnv4")) == 0)
+	    config = config_get (BGP_VPNV4_NODE, line);
+	  else if (strncmp (line, " address-family ipv4 multicast", strlen (" address-family ipv4 multicast")) == 0)
+	    config = config_get (BGP_IPV4M_NODE, line);
+	  else if (strncmp (line, " address-family ipv6", strlen (" address-family ipv6")) == 0)
+	    config = config_get (BGP_IPV6_NODE, line);
+	  else if (config->index == RMAP_NODE)
+	    config_add_line_uniq (config->line, line);
+	  else
+	    config_add_line (config->line, line);
+	}
+      else
+	config_add_line (config_top, line);
+      break;
+    default:
+      if (strncmp (line, "interface", strlen ("interface")) == 0)
+	config = config_get (INTERFACE_NODE, line);
+      else if (strncmp (line, "router rip", strlen ("router rip")) == 0)
+	config = config_get (RIP_NODE, line);
+      else if (strncmp (line, "router ospf", strlen ("router ospf")) == 0)
+	config = config_get (OSPF_NODE, line);
+      else if (strncmp (line, "router bgp", strlen ("router bgp")) == 0)
+	config = config_get (BGP_NODE, line);
+      else if (strncmp (line, "router", strlen ("router")) == 0)
+	config = config_get (BGP_NODE, line);
+      else if (strncmp (line, "route-map", strlen ("route-map")) == 0)
+	config = config_get (RMAP_NODE, line);
+      else if (strncmp (line, "access-list", strlen ("access-list")) == 0)
+	config = config_get (ACCESS_NODE, line);
+      else if (strncmp (line, "ip prefix-list", strlen ("ip prefix-list")) == 0)
+	config = config_get (PREFIX_NODE, line);
+      else if (strncmp (line, "ip as-path access-list", strlen ("ip as-path access-list")) == 0)
+	config = config_get (AS_LIST_NODE, line);
+      else if (strncmp (line, "ip community-list", strlen ("ip community-list")) == 0)
+	config = config_get (COMMUNITY_LIST_NODE, line);
+      else if (strncmp (line, "ip route", strlen ("ip route")) == 0)
+	config = config_get (IP_NODE, line);
+      else if (strncmp (line, "key", strlen ("key")) == 0)
+	config = config_get (KEYCHAIN_NODE, line);
+      else
+	{
+	  if (strncmp (line, "log", strlen ("log")) == 0
+	      || strncmp (line, "hostname", strlen ("hostname")) == 0
+	      || strncmp (line, "password", strlen ("hostname")) == 0)
+	    config_add_line_uniq (config_top, line);
+	  else
+	    config_add_line (config_top, line);
+	  config = NULL;
+	}
+      break;
+    }
+}
+
+void
+vtysh_config_parse (char *line)
+{
+  char *begin;
+  char *pnt;
+  
+  begin = pnt = line;
+
+  while (*pnt != '\0')
+    {
+      if (*pnt == '\n')
+	{
+	  *pnt++ = '\0';
+	  vtysh_config_parse_line (begin);
+	  begin = pnt;
+	}
+      else
+	{
+	  pnt++;
+	}
+    }
+}
+
+/* Macro to check delimiter is needed between each configuration line
+   or not.  */
+#define NO_DELIMITER(I)  \
+  ((I) == ACCESS_NODE || (I) == PREFIX_NODE || (I) == IP_NODE \
+   || (I) == AS_LIST_NODE || (I) == COMMUNITY_LIST_NODE)
+
+/* Display configuration to file pointer.  */
+void
+vtysh_config_dump (FILE *fp)
+{
+  struct listnode *nn;
+  struct listnode *nm;
+  struct config *config;
+  struct list *master;
+  char *line;
+  int i;
+
+  LIST_LOOP (config_top, line, nn)
+    {
+      fprintf (fp, "%s\n", line);
+      fflush (fp);
+    }
+  fprintf (fp, "!\n");
+  fflush (fp);
+
+  for (i = 0; i < vector_max (configvec); i++)
+    if ((master = vector_slot (configvec, i)) != NULL)
+      {
+	LIST_LOOP (master, config, nn)
+	  {
+	    fprintf (fp, "%s\n", config->name);
+            fflush (fp);
+
+	    LIST_LOOP (config->line, line, nm)
+	      {
+		fprintf  (fp, "%s\n", line);
+		fflush (fp);
+	      }
+	    if (! NO_DELIMITER (i))
+	      {
+		fprintf (fp, "!\n");
+		fflush (fp);
+	      }
+	  }
+	if (NO_DELIMITER (i))
+	  {
+	    fprintf (fp, "!\n");
+	    fflush (fp);
+	  }
+      }
+
+  for (i = 0; i < vector_max (configvec); i++)
+    if ((master = vector_slot (configvec, i)) != NULL)
+      {
+	list_delete (master);
+	vector_slot (configvec, i) = NULL;
+      }
+  list_delete_all_node (config_top);
+}
+
+/* Read up configuration file from file_name. */
+static void
+vtysh_read_file (FILE *confp)
+{
+  int ret;
+  struct vty *vty;
+
+  vty = vty_new ();
+  vty->fd = 0;			/* stdout */
+  vty->type = VTY_TERM;
+  vty->node = CONFIG_NODE;
+  
+  vtysh_execute_no_pager ("enable");
+  vtysh_execute_no_pager ("configure terminal");
+
+  /* Execute configuration file */
+  ret = vtysh_config_from_file (vty, confp);
+
+  vtysh_execute_no_pager ("end");
+  vtysh_execute_no_pager ("disable");
+
+  vty_close (vty);
+
+  if (ret != CMD_SUCCESS) 
+    {
+      switch (ret)
+	{
+	case CMD_ERR_AMBIGUOUS:
+	  fprintf (stderr, "Ambiguous command.\n");
+	  break;
+	case CMD_ERR_NO_MATCH:
+	  fprintf (stderr, "There is no such command.\n");
+	  break;
+	}
+      fprintf (stderr, "Error occured during reading below line.\n%s\n", 
+	       vty->buf);
+      exit (1);
+    }
+}
+
+/* Read up configuration file from file_name. */
+void
+vtysh_read_config (char *config_file,
+		   char *config_current_dir,
+		   char *config_default_dir)
+{
+  char *cwd;
+  FILE *confp = NULL;
+  char *fullpath;
+
+  /* If -f flag specified. */
+  if (config_file != NULL)
+    {
+      if (! IS_DIRECTORY_SEP (config_file[0]))
+	{
+	  cwd = getcwd (NULL, MAXPATHLEN);
+	  fullpath = XMALLOC (MTYPE_TMP, 
+			      strlen (cwd) + strlen (config_file) + 2);
+	  sprintf (fullpath, "%s/%s", cwd, config_file);
+	}
+      else
+	fullpath = config_file;
+
+      confp = fopen (fullpath, "r");
+
+      if (confp == NULL)
+	{
+	  fprintf (stderr, "can't open configuration file [%s]\n", 
+		   config_file);
+	  exit(1);
+	}
+    }
+  else
+    {
+      /* Relative path configuration file open. */
+      if (config_current_dir)
+	confp = fopen (config_current_dir, "r");
+
+      /* If there is no relative path exists, open system default file. */
+      if (confp == NULL)
+	{
+	  confp = fopen (config_default_dir, "r");
+	  if (confp == NULL)
+	    {
+	      fprintf (stderr, "can't open configuration file [%s]\n",
+		       config_default_dir);
+	      exit (1);
+	    }      
+	  else
+	    fullpath = config_default_dir;
+	}
+      else
+	{
+	  /* Rleative path configuration file. */
+	  cwd = getcwd (NULL, MAXPATHLEN);
+	  fullpath = XMALLOC (MTYPE_TMP, 
+			      strlen (cwd) + strlen (config_current_dir) + 2);
+	  sprintf (fullpath, "%s/%s", cwd, config_current_dir);
+	}  
+    }  
+  vtysh_read_file (confp);
+
+  fclose (confp);
+
+  host_config_set (fullpath);
+}
+
+void
+vtysh_config_write (FILE *fp)
+{
+  extern struct host host;
+
+  if (host.name)
+    fprintf (fp, "hostname %s\n", host.name);
+  fprintf (fp, "!\n");
+}
+
+void
+vtysh_config_init ()
+{
+  config_top = list_new ();
+  config_top->del = (void (*) (void *))line_del;
+  configvec = vector_init (1);
+}